Man has become master of the Earth’s surface. He is constantly probing into

游客2025-03-20 22

问题 Man has become master of the Earth’s surface. He is constantly probing into the earth’s depths and into atmosphere’s upper reaches.【C1】______ it is doubtful whether man, with all of his intelligence and vigor, holds his planetary seat with greater【C2】______ than a vast tribe of small, many-legged animals that pass their lives at his feet—the spiders.
Spiders are among the【C3】______ of science. They dwell at higher altitudes than any other【C4】______ of their size or larger. On the slopes of Mount Everest, at an altitude of twenty-two thousand feet—five thousand feet above the vegetation line—【C5】______ a species of black spider only a quarter of an inch long. This is an【C6】______ environment for creatures so delicately constructed. To protect themselves from the chill of night, they take shelter in crevices where the twenty-four-hour【C7】______ in temperature is only twelve degrees, as against forty-four on the outside.
Spiders live in other unlikely【C8】______ —rabbit burrows, flowers, anthills, and the desolate, drafty aeries of eagles. They have been found soaring through the air five miles【C9】______ the earth. One【C10】______ has been discovered in an African cavern more than two thousand feet underground. [br] 【C3】

选项 A、puzzles
B、mysteries
C、marvels
D、studies

答案 C

解析从下文提到的蜘蛛生活的地方可以推断，它们是科学上的一大奇迹，所以正确答案应选C。A项puzzles指"谜，难题"，B项mysteries指"神秘的事"，这两个选项均与下文提到的内容不相符合，因此都不是正确答案。D项studies是指"研究"，与原文意思相差更远。

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